Pneumatic jack and pump



' c. STEPHENS.

PNEUMATIC JACK AND PUMP. APPLICATION man APR; 17. 1920.

1,375,332., PatentedApr.19,1921.

/ I 2 $HEETSSHEET I.

WITNESSES l/VVE/VTUR 0% i ayd p n M6? W 6 A TTORNE Y8 C. STEPHENS.

PNEUMATIC JACK AND PUMP.

- APPLICATION FILED APR. 17. 1920. I 1,375,332. Patented Apr. 19, 1921.

' 2 SHEETS-SHEET 2.

I WITNESSES 47 69 49 5 1 'I/Vl/E/VTOR G g d9 56ephens, 67" 4'4 I ATTORNEYS umrEo ST- rias PATENT orsics.

4 CLYDE STEPHENS, OF ROSENDALE, MISSOURI.

PNEUMATIC JACK AND PUMP.

Specification of Letters Patent. 7 Patented A p 19 1921 Application filed April 17, 1920. Serial No. 374,608.

: To all whom it may concern Be it known that I, CLYDE STEPHENS, a

citizen of the United States, and a resident to the jack or' by a single mampulation may be adapted for use as a pump for infiating a tire or for general purposes.

Another object is to provide a device of this character of simple and durable construction, reliable in operation and comparatively easy and inexpensive in operation and comparatively easy and inexpensive to manufacture.

Other objects and advantages reside .in certain novel features of the construction,

combination and arrangement of parts.

which will be hereinafter mou'e fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming part of this specification, and in which:

Figure 1 is a perspective view of my im-,

provement, showing it in use with an automobile; Fig. 2 is a sideelevational view of the invention; Fig. 3 is an end elevational view of th jack end;

Fig. 4 is a view in vertical section, taken on a plane centrally and longitudinally of the device;

Fig. 5 is a sectional view through the valve block, valve and associated structure, on line 55 of Fi 3;

Fig. 6 is a horizontal sectional view, on line 66 of Fig. 4;

Fig.7 is a detail perspective, view of the turning plug of the controlling valve; and

Fig. 8 is a detail sectional view on the line 8-8 of Fig. 2.

Fig. 9 is a detail view in section of the pump piston, parts being shown in elevation for the sake of illustration.

Referring to the drawings, it will be seen that my invention contemplates a base 10 having on its up or surface" a um c linder boss 11 and a jack 'cylinder boss 12 A valve block 13,. preferably integral with the base 10 s provided in its interlor with suitable ducts which serve to establish communlcation between the pump and the jack, the pump and the ack and the atmosphere, as willbe hereinafter more fully described.

tire or the like, or the A pump'cylinder 14, preferably of metallic construction has its lower end externally threaded and engaged with the internal threads formed on theboss 11. The upper end of the cylinder is also externally threaded to cooperate with the internal threads of the cap 16. The cap is centrally apertured to permit passage therethrough of the plunger rod 17 of the pump and this cap is also provided with a port 18 for admission of the air. The rod 17 carries a plunger 19 of the pump, which is reciprocated in the cylinder 14. I'This plunger 19 may be ofconventional construction which embodies the usual leather washer on the plunger which permits the air to 'fiow the upstroke, but prevents the air from passing the plunger on the down stroke, but

it is preferred to construct the plunger with a radial bore 20 communicating with the cylinder on the upper side of the plunger and an axial bore 21 which communicates with the radial bore and with the cylinder on the lower side of the plunger, as shown,

in Fig. 9.. The axial bore receives a piston valve 22, the stem of which carries a coil spring 23 which tends to seat the valve. It is obvious that on the down stroke of the plunger the valve will be seated, whereas on the upstroke the atmospheric pressure will open the valve to permit air to flow to the lower side of the plunger.

A handle 24 has a depending apertured car 25 received between the spaced apertured cars 26 formed on the upper end of the plunger rod 17. These apertures are alined and receive a pin 27. If desired thls handle maybe formed in two parts detachably secured together by a threaded shank and socket 28 and 29, respectively, as shown past the plunger on.

in Fig. 4. Integrally formed with the handle is a yoke 30, the arms of which are pivotally secured at their outer ends to theupper ends of parallel links 31 which lmks have their lower end pivotally secured to the base 10. The handle serves to reciprocate the plunger in the pump and due to the pivotal connection of the handle to the plun er rod and the pivotal connection to the orwardly inclined links 31 the handle gains in leverage as the piston descends,

consequently the leverage is greatest when the compression is greatest The pneumatic jack 'cyllnder 32 has its lower end externally threaded, and engaged with the internal threads formedon the boss 12. A cap 33 closes the upper end of the jack cylinder and is provided with a central opening to slidably receive the jack. The piston rod 34' carries at its lower end a iston 35 which is freely movable within t e jack cylinder both longitudinally thereof and rotatabl thereto. In order to obtain t is-freedom of 'movement without loss of pressure the the piston rod 34 of.

with respectthe lower end is 0 en as shown in Fig. 4.

This bag is adapted to expand or be collapsed under the influence of the pressure delivered thereto and in expanding it communicates motion to the piston 36 of the w elevated position. The

bars carry a guide collar 42 slidable on the I to desired osition with respect to the jack cylinder. no of the depending bars 41 is provided with a ratchet surface 42 with with the ratc cylinder so t head and piston rod to rectilinear motion and braces and reinforces the lifting ack to elevate the same, and as long as the ag is expanded it will retain the piston in upper end of the piston rod 34 carries a cross head 39 which has a bearing surface '40 formed on its upper side whereby the cross head 39 may withinth function as the lifting foot of the jack. The

extremities of the cross head; support depending bars 41 and the lower end of these jack cylinder.

T to a workin l1 fit on the surface of the jack at while it constrains the cross does not interfere with the free and ready rotary which the dog 43carried by the foot 45 cotiperates. foot 45 may be canted on the depending bar so as to swm the dogl43 out of engagement et surface 42 to lower the foot or it will be-automatically canted when the foot is elevated.

The lower end of the pump cylinder is provided with a port 46 which communi body 44 of r V cates with an eduction duct ,47 of the valve block. The eduction duct 47 extends first the cross head, it

or other adjustment of the cross head e guidecollar is adapted The lifting iention as a horizontally and then venticall of the valve block, as shown in igs. 5 and 6. The controlling valve, indicated generally at 48, is mounted on the valve block adjacent the'eduction duct 47 and also adjacent the induction duct 49 which leads to the port 50 in the lower end of the jack cylinder.

The induction duct 49 extends vertically,

in the valve block to and then. horizontally the port 50 of the jack cylinder, Figs. 5 and 6. t

The controlling valve 48 is adapted to es- }ts shbwn in tablish. communication, between the' pump V the top.

and'the jack but to cut off communication between .the pump and the jack and estab lish communicationbetween the pump and the flexible .pipe 51, which may be connected to the tire or to the point where the pressure .is desired. This valve comprises a casing 52 in which is rotatably mounted a turning plug 53 having a handle 54 referably in-- tegrallyformed therewith. The periphery of the turning plug is providedv with a circumferential groove 55. This groove is adapted to establish communication between the inlet port 56 of the valve casing and-the outlet port 57 of .the valve casing which ports communicate respectively. with the eduction duct 47 and induction duct 49. Again the turning plug 54 may be revolved d dasing so that a solid portion of the plug seals the ports 57 and thereby shuts off communication between the eduction duct 47 and induction duct 49. ;In this position the valve establishes communication between the eduction duct 47 and a second outlet port .56 which outlet port communicates with the pipe 51. A sp r1ng actuated check valve 59. is disposed in the eduction duct 49 and permits flow of the fluid through the induction duct to the jack cylinder but prevents back flow therein. i For relieving the pressure within the jack to lower the same, I provide a vent 60 which communicates with the induction duct 49 intermediate the port 50 and the check valve 59. A valve 61 controls. this vent so as to establish communication between the vent and the atmosphere or cut off such communication, as desired. This valve comprises a casing 62 having a bore 63 therethrough and a cavity 65 in communication with the bore 6 A turning plug 66 is rotatably mounted.in the cavity and is provided with'a, diametric bore 67, which may be turned to register with the bore 63, and thus establish communication between the induction port 49 and the atmosphere or it maybe turned at right agigles to the bore 63 to cut of]? communicati 11 between the induction duct 49 and the atmosphere.

In. practice, if i is desired to use the inni e and jack, as for instance.

neath the axle of the automobile, as seen in Fig. 1. In this instance it is usually desired to use the cross head or the lifting foot of the jack and the cross head being freely movable may be readily adapted to the exigencies of the particular case. of the valve 53 is then turned so that communication between the 'eduction duct 47 and induction duct 49 is established and the handle 24 is reciprocated. The pressure then builds up in the jack cylinderexpanding the bag 37 and forcing the piston upwardly elevating the jack. The tire ma then be removed and replaced or remove repaired and replaced, and if necessary, may be inflated while in elevated, position, this latter being accomplished simply by turning the valve 53 so as to establish communication between the eduction duct 47 and the pipe 51, the pipe 51, of course, being connected with the valve stem of the tire. Further reciprocation of the handle 24 serves to inflate the tire. After the tire has been inflated thevalve 66 may be turned to lower the 'ack.

y inventionis capable of numerous other uses and advantages, which will be apparent to those skilled in the art.

I claim:

1. In a device of the character described, a base, a pump having its cylinder mounted on said base, a pneumatic jack having its cylinder mounted on said base adjacent said pump cylinder, means for establishing communication between said pump cylinder and the lower end of said jack cylinder, a flexible bag having its u per end closed and its lower end open an secured to the lower end of the jack cylinder to receive the pressure from said pump cylinder, a piston engaging said bag and actuated thereby, a piston rod connected to said piston, a cross head mounted on said piston rod, depending bars carried by said cross head, a guide collar carried by the lower end of said bars and slidable on the periphery of said jack cylinder,

and a jack 'foot adjustably mounted on one i of said bars.

V 2. In a device of thecharacter described, a base, a pump'having its cylinder mounted on said base, a pneumatic jack having its cylinder mounted on said base adjacent said pump cylinder, means for establishing communication between said pump cylinder and said jack cylinder, a piston mounted in said jack cylinder, a piston rod connected to said The handle 54 on said valve block and -endsof said. bars and slidable on the periphery of said jack cylinder. 7 I

In a device of the character described, a base, a pump having its cylinder mounted on said base, a pneumatic jack having its cyinder mounted on said base adjacent said pump cylinder, means for establishing communlcation between said pump cylinder and said jack cylinder, a piston mounted in said jack cylinder, a piston rod connected to said piston, a cross head mounted on said piston rod, depending bars carried by said cross head, a guide collar carried by the lower ends of said bars and slidable on the periphery of said jack cylinder, and a jack foot adjustably mounted on one of said bars.

4. In a device of the character described, a pneumatic jack having a c linder, a piston mounted in said jack cylind er, a piston rod connected to said piston, a cress head mounted on said piston rod, depending bars carried b said cross head, anda ide collar c'arrie by the lower ends of said bars and slidable on the periphery of said jack cylinder.

5. In a device of the character described, a base, a pump having its cylinder mounted on said base and provlded with a port at its lower end, a pneumatic jack having its cylinder mounted on said base adjacent said pump cylinder and provided with -a port at its lower end, a valve block formed on said base intermediate said cylinders and having spaced horizontal ducts therein communicating respectively with said ports and having vertical ducts communicating with said horizontal ducts and leading to the top oi said valve block, a valve casing mounted embracing said vertical ducts and having ports communicating therewith and having a third port a turning plug arranged in said valve casing and having a circumferential groove therein adapted to establish communication between the ports communicating with said .ducts or becation may be established between said pump v and said pipefor between said pump and said jack. i

- OLYDE STEPHENS. I 

